void setup() {
  // put your setup code here, to run once:
for(int LED = 1; LED <= 10; LED++){
  pinMode(LED, OUTPUT);
}
}

void loop() {
  // put your main code here, to run repeatedly:
for(int LED = 1; LED <= 10; LED++){
  digitalWrite(LED, HIGH);
  delay(100);
  digitalWrite(LED, LOW);
}
}